Here is a screenshot. It seems to only be inside certain caves. I used Realvision with most of his recommend mods for awhile with no issues. I switched from RLO to Enhanced lights and FX. This is when I started seeing this happen. I reinstalled Skyrim and the mods but it didn't work. Any ideas on a fix?

What you are seeing is what you get when textures are missing. If you've installed texture packs then you need to go back and re-install them - read the install directions carefully to make sure stuff is being put in the right directory.

Purple texture usually means either a texture is missing from the vanilla files (if a replacer texture was missing, the game would default to the vanilla texture instead of doing the purple no-texture thing), or you've got an esp that's changing the texture path for a vanilla asset, or you're dealing with a non-vanilla asset.

Those are normal rocks so it's not the latter. When you say "Skyrim HD 2k textures", are you talking about the official Bethesda DLC, or a mod?

Deactivate the mod, and check in game to see if those rocks are still pink.

If they aren't, that means your texture mod probably has an esp file that's changing the texture paths for some reason. Try redownloading the mod (it might just be one corrupted texture file). If that doesn't work, you could try to track down the offending texture and texture path using the CK, but if you don't know how to use the CK, it's probably easiest to just ditch that texture mod and find an alternate one.

If they are, that means part of your Skyrim files are missing or corrupted, in which case do a game cache validation through Steam, on if that doesn't fix it, do a reinstall of the game

When I verify game cache it says I am missing one file and will be reaquired, but I don't think it's actually being reaquired.

Yeah, that happens with a lot of games. It's something like a unique Steam ID file that's generated for every install, and when you verify, Steam doesn't recognize it for some reason and thinks it has to make a new one.

Deactivated the mod and the pink was still there. Verifying didn't work either. My first reaction to this problem was reinstalling...and I came up with the same issue. Maybe I should reinstall and not add any texture mods to see if that will work?

You can try. Texture replacers shouldn't change anything persistant though. The game is basically built to go "if there is a texture with the same name in folder X in the data file, call that instead of the default texture when rendering", and most texture and mesh replacers are based off that mechanic.

The game doesn't actually remember replacement assets If there's nothing in the data folder where the replacement texture would go. Only way that would happen is if the mod used an esp that got regestered in save files created while the esp was active.

Try starting a new game without the texture mod present instead of opening a previous save. If you're still seeing purple rocks in the fresh game, then it's a problem with the game or game data itself, not a mod. If you're not seeing it in the fresh game, that means that mod (or another one, sometimes that can happen if a mod author was sloppy) has borked the texture path in a way that has effected your saves.

In fact, in the latter case, try going through your other mods to see if deactivating any of them makes a difference. Texture replacers really shouldn't come with esps unless the've got special mod manager optional bits, so it's actually more likely that it's an error in a different mod than the actual texture mod that's to blame.

1 file is missing, is the game finds your graphic card settings.Not knowing much on graphic mods but UFO mod cause me some issues, because the followers/NPC's where loaded up before that mod and the clothing was purple.